/*
 * Copyright (c) 2008-2009 Telecom Bretagne
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Mehdi Benamor <benamor.mehdi@ensi.rnu.tn>
 */

#ifndef IPV6_AUTOCONFIGURED_PREFIX_H
#define IPV6_AUTOCONFIGURED_PREFIX_H

#include "ns3/ipv6-address.h"
#include "ns3/timer.h"

#include <list>
#include <ostream>
#include <stdint.h>
#include <vector>

namespace ns3
{
class Node;

/**
 * @ingroup ipv6
 *
 * @brief Router prefix information.
 */
class Ipv6AutoconfiguredPrefix : public Object
{
  public:
    /**
     * @brief Constructor.
     * @param node node
     * @param interface interface index
     * @param prefix IPv6 address
     * @param mask bitmask prefix
     * @param preferredLifeTime the preferred life time
     * @param validLifeTime the valid life time
     * @param router if it the prefix that configure the default gateway
     */
    Ipv6AutoconfiguredPrefix(Ptr<Node> node,
                             uint32_t interface,
                             Ipv6Address prefix,
                             Ipv6Prefix mask,
                             uint32_t preferredLifeTime,
                             uint32_t validLifeTime,
                             Ipv6Address router = Ipv6Address("::"));

    /**
     * @brief Destructor.
     */
    ~Ipv6AutoconfiguredPrefix() override;

    /**
     * @brief Set the default gateway router.
     * @param router IPv6 link-local address of the default router
     */
    void SetDefaultGatewayRouter(Ipv6Address router);

    /**
     * @brief Get the default gateway address.
     * @return IPv6 link-local address of the default router
     */
    Ipv6Address GetDefaultGatewayRouter() const;

    /**
     * @brief Get the interface index.
     * @return interface index
     */
    uint32_t GetInterface() const;

    /**
     * @brief Set the interface.
     * @param interface interface index to set
     */
    void SetInterface(uint32_t interface);

    /**
     * @brief Get the prefix preferred life time.
     * @return preferred life time
     */
    uint32_t GetPreferredLifeTime() const;

    /**
     * @brief Set the prefix preferred life time.
     * @param p the prefix preferred life time
     */
    void SetPreferredLifeTime(uint32_t p);

    /**
     * @brief Get the prefix valid life time.
     * @return valid life time
     */
    uint32_t GetValidLifeTime() const;

    /**
     * @brief Set the prefix valid life time.
     * @param v the prefix valid life time
     */
    void SetValidLifeTime(uint32_t v);

    /**
     * @brief Test if the prefix is preferred.
     * @return true if prefix is in preferred state, false otherwise
     */
    bool IsPreferred() const;

    /**
     * @brief Test if the prefix is valid.
     * @return true if prefix is in valid state, false otherwise
     */
    bool IsValid() const;

    /**
     * @brief Set the prefix as preferred.
     */
    void SetPreferred();

    /**
     * @brief Set the prefix as valid.
     */
    void SetValid();

    /**
     * @brief Start the preferred timer.
     */
    void StartPreferredTimer();

    /**
     * @brief Start the valid timer.
     */
    void StartValidTimer();

    /**
     * @brief Stop the preferred timer.
     */
    void StopPreferredTimer();

    /**
     * @brief Stop the valid timer.
     */
    void StopValidTimer();

    /**
     * @brief Set the prefix as preferred.
     */
    void MarkPreferredTime();

    /**
     * @brief Set the prefix as valid.
     */
    void MarkValidTime();

    /**
     * @brief Signal that the preferred time expired and start the valid timer.
     */
    void FunctionPreferredTimeout();

    /**
     * @brief Signal that the valid time expired.
     */
    void FunctionValidTimeout();

    /**
     * @brief Remove this prefix from the prefix list.
     */
    void RemoveMe();

    /**
     * @brief Get the prefix identifier.
     * @return id of the prefix.
     */
    uint32_t GetId() const;

    /**
     * @brief Get the prefix address.
     * @return prefix address
     */
    Ipv6Address GetPrefix() const;

    /**
     * @brief Set the prefix address.
     * @param prefix prefix address to set
     */
    void SetPrefix(Ipv6Address prefix);

    /**
     * @brief Get the bitmask prefix.
     * @return bitmask prefix
     */
    Ipv6Prefix GetMask() const;

    /**
     * @brief Set the bitmask prefix.
     * @param mask prefix
     */
    void SetMask(Ipv6Prefix mask);

  private:
    /**
     * @brief a static identifier.
     */
    static uint32_t m_prefixId;

    /**
     * @brief the identifier of this prefix.
     */
    uint32_t m_id;

    /**
     * @brief The node.
     */
    Ptr<Node> m_node;

    /**
     * @brief The prefix IPv6 address.
     */
    Ipv6Address m_prefix;

    /**
     * @brief The prefix bitmask (length).
     */
    Ipv6Prefix m_mask;

    /**
     * @brief Default gateway router.
     *
     * If the RA received also configured the default gateway,
     * this variable has the link-local address. Otherwise this
     * is "::"
     */
    Ipv6Address m_defaultGatewayRouter;

    /**
     * @brief The interface index (which is stored the address
     * corresponding of the prefix).
     */
    uint32_t m_interface;

    /**
     * @brief the valid life time.
     */
    uint32_t m_validLifeTime;

    /**
     * @brief the preferred life time.
     */
    uint32_t m_preferredLifeTime;

    /**
     * @brief true if the prefix is preferred.
     */
    bool m_preferred;

    /**
     * @brief true if the prefix is valid.
     */
    bool m_valid;

    /**
     * @brief the timer for preferred life time.
     */
    Timer m_preferredTimer;

    /**
     * @brief the timer for valid life time.
     */
    Timer m_validTimer;
};

} /* namespace ns3 */

#endif /* IPV6_AUTOCONFIGURED_PREFIX_H */
